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    • Effects of Pre-Chamber Channel Diameters and Shapes on the Knock of A Low-Speed Natural Gas Dual Fuel Engine
    DOI：10.13949/j.cnki.nrjgc.2023.01.010
    Key Words:knock  low-speed diesel–natural gas dual-fuel engine  pre-chamber channel  flame jet  3D CFD simulation
    Author NameAffiliationE-mail
    LIU Bo* China Shipbuilding Power Engineering Institute Co.， Ltd.， Shanghai 201206， China lb@cspi.net.cn 
    WU Yue* College of Power and Energy Engineering， Harbin Engineering University， Harbin 150001， China wuyue258@hrbeu.edu.cn 
    WU Zan College of Power and Energy Engineering， Harbin Engineering University， Harbin 150001， China  
    LIU Long College of Power and Energy Engineering， Harbin Engineering University， Harbin 150001， China  
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    Abstract:The effects of pre-chamber channels with different diameters and various shapes， including the flared and contracted shape， on engine knock were studied based on three-dimensional numerical simulation. Results illustrate that， under knock condition， the smaller diameter of the pre-chamber channel， the smaller pressure difference caused by the flame jet. As a result， the pressure difference enhancement effect caused by the heat release of the flame surface can be reduced， and the knock intensity can be further reduced. The flared pre-chamber channel could decrease the initial pressure difference. Nevertheless， a phenomenon of continuous flame jet flowing into the main chamber occurs which will increase the intensity of pressure difference and knock. On the contrary， the contracted pre-chamber channel can reduce the occurrence of this phenomenon and reduce the knock intensity.
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